On 22 Sep 2009, at 11:16, Joseph Wakeling wrote:
Hans Aberg wrote:
What you see is that
(i) without naturalizeMusic, transposition fails: transposition
alone
leaves the final pitch being 'g+5/4' which has no accidental
I think is just a bug. Somehow the sharp drops out.
It's not so much a bug as a notational impossibility.
Think of pitch as being staff position s plus alteration a. The
latter
is used to determine the accidental. So in this case we're dealing
with
a base pitch of g+1, which is displayed as g-double-sharp.
Now you transpose it up a quarter-tone, so all pitches are altered by
+1/4. Your pitch is now g+5/4 and there is no accidental for +5/4
so of
course one can't be displayed.
The correct accidental is a # plus a !/4. It then does not change the
scale degree. This will also be correct in if the sharp and microtonal
accents are relative a tuning system other than E12.
So, if there _is_ a bug, it's that Lilypond doesn't recognise that an
alteration of >1 should change the staff position.
In this case, staff position only changes if enharmonic equivalents
are applied. This is how it should be.
The question is, how to incorporate
a well-defined chromatic transposition rule as an option in Lilypond
as
opposed to a function à la naturalizeMusic?
The staff system is what I call diatonic. It cannot be changed,
because that is how it was designed around year 1600. I made a
description of it using minor, major and neutral seconds. I can think
of generalizations, where the staff indicates an arbitrary choice
pitches, but I do not think that musicians could read it.
So you want is a mixture if the traditional system and enharmonic
equivalents.
Hans
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